Which Top player needs nerf the most?

I am doing this as a curiosity question and the fact that some champions are getting nerfs for reasons that community qq'd about them. I actually wanna see what the community thinks an op champion is and if riot will ever revamp the champs with this information.

Riot does nerf champions based on community feedback, but not always, they also nerf champions when they know they are "sleeper OP" even if the playerbase are completely unaware of it. The best example of this would be AP Gragas nerf when everyone still built him tank.

Lee Sin isn't OP top lane, but his shield bottom lane (if he's playing support) can be extremely strong. I don't know if it warrants a nerf, but with the amount of QQ on the forums about Lee as of late I'm sure Riot will cave into the whiners and over-nerf him since that's their M.O.

Reasons for this i really do want to know. Riven was not considered op to much but apparently shes getting a huge nerf. I want to see what the community honestly thinks which champ needs a revamp/nerf.